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Note 7 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Insurance accruals | $ 34,889 | $ 27,700
Allowance for doubtful accounts | 7,649 | 6,605
Compensation accrual | 10,461 | 3,661
Deferred compensation accrual | 20,396 | 17,620
Federal benefit of state uncertain tax positions | 10,364 | 8,681
State NOL carry-forward | 6,041 | 4,944
Other | 4,626 | 3,134
Total gross deferred tax assets | 94,426 | 72,345
Valuation allowance | (6,041) | (4,944)
Total deferred tax assets, net of valuation allowance | 88,385 | 67,401
Deferred tax liabilities: |  |
Plant and equipment, principally due to differences in depreciation | 696,913 | 566,396
Prepaid permits and insurance, principally due to expensing for income tax purposes | 33,594 | 28,089
Other | 1,339 | 14,786
Total gross deferred tax liabilities | 731,846 | 609,271
Net deferred tax liability | $ 643,461 | $ 541,870

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